Liquid purification or separation – Processes – Treatment by living organism
Patent
1997-09-25
1999-05-18
Upton, Christopher
Liquid purification or separation
Processes
Treatment by living organism
210802, 210188, 2101954, 210262, 210521, 210539, 2105321, B01D21/00;19/00
Patent
active
059048506
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a settling device for a fluid containing liquid, gas and particulate material, comprising: is fitted, for the trapping of gas bubbles, at least one cap having a ridge situated opposite a downwardly directed open side, and been trapped beneath the cap.
BACKGROUND OF THE INVENTION
A settling device of this kind is known from EP-A1-0,244,029 and EP-A1-0,193,999. These publications describe caps which are fitted horizontally in overlapping connection and which are fitted to limit the top edge of a fermentation chamber so as to form a settling chamber above it. The caps trap gas bubbles rising from the fermentation chamber, whilst transfer of remaining fluid in the upward direction between the caps is permitted. The trapping of gas bubbles ensures that the fluid in the settling chamber is relatively still relative to the fluid in the fermentation chamber, the latter fluid being in a state of motion as a result of the rising gas bubbles. The fact that the fluid present in the settling chamber is relatively still means that particles which are present therein and have been carried along from the fermentation chamber are able to settle, these particles being able to fall back between the caps to the fermentation chamber. The settling devices known from these publications have the drawback, however, that, when major turbulences occur, bubbles can easily be passed between the caps and then make their way into the settling chamber, thereby having an adverse effect upon the settling in the settling chamber. Smaller gas bubbles, in particular will slip through easily between the caps.
The object of the present invention is, inter alia, to eliminate the above-mentioned drawbacks.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide a settling device in which a liquid, gas and particulate material can be separated, such that at the top of the settling device a liquid is collected which is largely free from particulate material and also, preferably, gas.
This object is achieved according to the invention by the fact that the at least one cap is disposed with its longitudinal axis at an angle to the water level, such that fluid supplied at the bottom of the settling chamber flows obliquely up, forced along the bottom of the at least one cap, whilst gas bubbles contained therein collect in the ridge of the at least one cap, and by the fact that the gas-discharge means trap below the water level the gas collected in the ridge of the at least one cap.
Since fluid is supplied at the bottom of the settling chamber and liquid is discharged at the top of the settling chamber, an upward flow of fluid will be generated in the settling chamber. The obliquely placed caps ensure that this upward flow follows an oblique course. During this oblique upward flow of fluid, the gas bubbles present therein will rise, as a result of their climbing capacity, more steeply than the rest of the fluid and will finally come into contact with the obliquely placed cap. The obliquely placed cap subsequently permits a further upward gas flow in the direction of the ridge of the cap. As the fluid flows obliquely upward, the gas bubbles contained therein are thus collected in the ridge of the cap. By trapping the gas collected in the ridge of the cap below the water level, this gas is prevented from setting in motion the fluid at the water level. The fluid at the top of the settling chamber will then be in a relatively still state, so that particles still contained in the fluid are deposited here more easily. By an obliquely placed cap should here be understood a body whose longitudinal axis, for the purpose of the oblique placement, runs at an angle to the water level (or horizontal) and whose bottom side, viewed in a direction perpendicular to the longitudinal axis, the so-called transverse direction, for the purpose of forming a cap, likewise runs at an angle to the water level (or horizontal). The ridge of the cap is in this case situated on the high side of
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Paques B.V.
Upton Christopher
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